發(fā)布時(shí)間：2018-01-03 05:09

  本文關(guān)鍵詞：長(zhǎng)沙至昆明客運(yùn)專(zhuān)線玉屏至昆明段柳樹(shù)灣順層滑坡分析與治理　出處：《西南交通大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 順層滑坡 變形特征 穩(wěn)定性評(píng)價(jià) 影響因素 治理措施

【摘要】：玉屏至昆明段鐵路線作為西南地區(qū)的路網(wǎng)主骨架的干線之一,是滬昆客運(yùn)專(zhuān)線和京廣線聯(lián)結(jié)的重要交通要塞。柳樹(shù)灣順層滑坡位于玉屏至昆明段鐵路線中段,開(kāi)挖過(guò)程受暴雨影響,沿著巖性差異面發(fā)生失穩(wěn)破壞。本文結(jié)合研究區(qū)區(qū)域地質(zhì)條件,通過(guò)野外調(diào)查和室內(nèi)試驗(yàn),掌握了滑坡形態(tài),影響因素以及形成機(jī)制;通過(guò)數(shù)值模擬,分析位移、應(yīng)力和塑性區(qū)分布對(duì)柳樹(shù)灣滑坡進(jìn)行穩(wěn)定性分析;運(yùn)用極限平衡法計(jì)算剩余滑坡推力,對(duì)柳樹(shù)灣滑坡進(jìn)行防護(hù)設(shè)計(jì)計(jì)算,并運(yùn)用數(shù)值分析進(jìn)行驗(yàn)算,證明結(jié)果的可靠性。本文的主要研究成果如下:(1)通過(guò)野外調(diào)查確定了柳樹(shù)灣順層滑坡的滑坡范圍和不穩(wěn)定區(qū)域滑體的主軸方向?yàn)镹68° W,垂直于線路,滑坡的主軸長(zhǎng)度約100m,寬度為125m,滑體厚度為5～16m,主要為碎石土,滑塌方量約為12.5萬(wàn)m~3(2)通過(guò)野外調(diào)查,探明了邊坡的失穩(wěn)因素,確定了降雨為主要的誘發(fā)因素,降雨導(dǎo)致順層邊坡的巖層差異面強(qiáng)度明顯降低;研究區(qū)軟巖含泥量較高,遇水軟化,在強(qiáng)降雨作用下,泥灰?guī)r的持續(xù)軟化是本區(qū)緩傾角深層巖質(zhì)滑坡發(fā)生的直接原因。(3)計(jì)算了滑坡的下滑推力及其穩(wěn)定系數(shù),分析了三個(gè)滑坡剖面在天然狀態(tài)下和暴雨?duì)顟B(tài)下該滑坡的穩(wěn)定性,發(fā)現(xiàn)其整體處于穩(wěn)定或者基本穩(wěn)定的狀態(tài),剖面Ⅰ-Ⅰ',Ⅲ-Ⅲ'前緣變形區(qū)處于不穩(wěn)定狀態(tài),Ⅱ-Ⅱ'前緣變形區(qū)處于穩(wěn)定狀態(tài)。并對(duì)開(kāi)挖后的邊坡進(jìn)行了數(shù)值模擬的分析,結(jié)果分析發(fā)現(xiàn)邊坡下滑趨勢(shì)明顯。(4)根據(jù)極限平衡法計(jì)算得出的下滑推力,給出了相應(yīng)的治理措施,通過(guò)對(duì)治理后的柳樹(shù)灣滑坡進(jìn)行數(shù)值模擬,得到的穩(wěn)定系數(shù)滿(mǎn)足設(shè)計(jì)要求。
[Abstract]:As one of the main backbone of the railway network in southwest China, the railway line from Yuping to Kunming is an important traffic fortress connecting the Shanghai-Kunming passenger dedicated line and the Beijing-Guangzhou line. The down-layer landslide in Liushuwan lies in the middle section of the railway line from Yuping-Kunming. The excavation process is affected by the rainstorm and the instability occurs along the lithologic difference surface. Combining with the regional geological conditions of the study area, through field investigation and laboratory tests, the paper grasps the landslide shape, influencing factors and forming mechanism. The stability of Liushuwan landslide was analyzed by numerical simulation, displacement, stress and plastic zone distribution. The residual landslide thrust is calculated by the limit equilibrium method, and the protection design of the Liushuwan landslide is calculated, and the numerical analysis is used to verify the calculation. The main research results of this paper are as follows: 1) through field investigation, the landslide range of the bedding landslide in Liushuwan and the direction of the main axis of the sliding body in the unstable area are determined to be N68 擄W. Vertical to the line, the length of the main shaft of the landslide is about 100m, the width is 125m, the thickness of the slide body is 5m / 16m, mainly is gravel soil, and the landslide volume is about 125,000 mm2 / 3 / 2) through field investigation. The factors of slope instability are proved, and the rainfall is determined as the main inducing factor, which leads to the obvious decrease of the strength of the strata difference surface of the bedding slope. The soft rock in the study area has a high content of mud and softens with water, and it is under the action of heavy rainfall. The continuous softening of mudstone is the direct cause of the occurrence of deep rock landslide in the area with slow dip angle.) the sliding thrust and the coefficient of stability of landslide are calculated. The stability of three landslide sections under natural and rainstorm conditions is analyzed. It is found that the whole landslide is stable or basically stable, section 鈪，

本文編號(hào)：1372497